using System;

public class Program

{

    public static void Main()

    {

         Console.WriteLine("Délky zadejte v cm.");

            Console.WriteLine("Napište a: ");

            float a = Convert.ToInt32(Console.ReadLine());

​

            Console.WriteLine("Napište b: ");

            float b = Convert.ToInt32(Console.ReadLine());

​

            Console.WriteLine("Napište c: ");

            float c = Convert.ToInt32(Console.ReadLine());

​

            float s = (a + b + c) / 2;

​

            double obsah = Math.Sqrt(s*(s-a)*(s-b)*(s-c));

            obsah = Math.Round(obsah, 2);

​

            Console.WriteLine("Obash má " + obsah +"cm");

​

            float obvod = a + b + c;

​

            Console.WriteLine("Obvod má " + obvod + "cm");

​

    }

}